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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3a2c68a0bdf42f909c6d4626b8dfd56fd8d0decb16ffe7624f5db4e3d20c1c' 
  AND token = 'MRfGn9GPsikU4eCnkCem9vi3aGR2YZpDERoh8j9z7yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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