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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be57e51f7107c20317ac9b2985c0649260edc20f0b531f2c8fffe564d5c3a079' 
  AND token = '5INFNkMTShdJgZ8T3ygGyR72RR7uIbSSOjsqovsobZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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