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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903ed6048a65d00dbbd49599a96ec07a87947bc6f9d431582c026a0e68fb9275' 
  AND token = 'V5CrhreJ+w58H9BPWtzK4ume603WR8gxkF+m53mxN8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}