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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fd5dad8e6ad4f210238df26fd4ad277752158809c14b722e17774c593b5d87' 
  AND token = 'roYZpl+HMZKueQZEGsaZSwzKfaQa5+oGl+ohfEX10lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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