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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87c20c5ec85a76d1bb478e3aac3031203ed040c9e8adc2243cddfd06e86eb17' 
  AND token = '9yDxpc/z3gMA5N2xpRhs6b0IMSpmTq5x/L2SInRMegE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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