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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b54a9b4c4d677597fb1f7d8ff4a9034a3980f7e333a8ded79935cd39179d3f3' 
  AND token = 'Bi7xe6I2Cye9oO5u89g2FTZV9js4YZ/VkKLaIJ9T/qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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