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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74a45081e2706af986cfcee21b7dee5e73333c03d9dc1248ba3e9590bef75ba' 
  AND token = 'jl70vSUjYA4HwKQQM5VCLR0xlyIzZZcr9isa+D51NV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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