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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b6c74aed03d6921ac0a7bcd154186863c54842e098e2ffc7ffcf14c4d84d53' 
  AND token = 'enCaD6BoFeBXWe3dXkoM2l838fDOFzJSHVfwzJ04hu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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