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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecedd6977d0b957b4c421b72c62e4d59610dac03ab622d9715d35226eed56dd3' 
  AND token = '6EQPjemshp7MH+rgxSPcH8jya1+qGQmag+lSrzaSwpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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