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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c27514865c53cdd0ed863780b70051b28477720879897c9e52faeda702cfa8' 
  AND token = 'buvuMvcSKY2DcFehI3moR05jlsfqEr2y6SqSOL5F4hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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