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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374f7b07bb7e39a1125e5df4a46b0e0b1b3ba9cc0a9701b87b826a8e0f957ed4' 
  AND token = 'i7MiB99U8o06f/Jx6YrEOIF6uy7rwvUHHbMTp0uSnU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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