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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0924aa9f53cdfa935e0568657b0175e4d3bd028d17eb0b778b1f9efb1b13dd' 
  AND token = 'Tq18O4VnLT+0pcWVcV3QX+LS5w9in4C287LAcS+x8SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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