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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df39fc7c9ccacf8febb15e540fdd15107b071b785fcb62dc284eaadcbfe67c4' 
  AND token = 'kML19QG8/zApF9XRZf0GDzLawcN1WRLy4aBfTNAcTrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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